The virus is called Nidovirus. Not sure I would say it is widespread so much as now that people are much more aware it is being diagnosed and reported better. It is still early in the understanding but it seems that it may be more dangerous to chondros (which is NOT to say that carpets are safe/immune, they can and do get the disease). Again, I would refer you to MPR to learn more, they have had a few episodes on it in the last couple months. GTP Keeper Radio also did a discussion on it.